Intoduction to GM Foods and Trangenic Plants
Genetically modified (GM) organisms or genetically engineered (GE) organisms are basically plants, animals, or any organism whose DNA is being altered by using various genetic engineering techniques. On the other hand, Transgenic plants are plants having genes inserted into them derived from another species; the inserted genes can have origin from species within the same kingdom (plant to plant) or among different kingdoms (bacteria to plant). In many cases, the inserted DNA has to be modified slightly in order to be correctly and efficiently expressed in the host organism. Here, transgenic techniques have been utilized to furnish better agricultural products by making transgenic plants.

Genetically modified (GM) foods are transgenic plants that are used as a food, developed and marketing since there is some perceived advantage either to the producer or consumer of these foods. The GM crops currently in the market are primarily intended at an improved level of crop protection through the introduction of resistance against insects, plant pathogen, and increased resistance towards herbicide and other climatic states of affairs like salt and drought resistance. In some of the GM crops higher nutritional quality and yield have also been introduced. Numerous techniques are employed at the molecular level to integrate or create new resistance factors in a plant which can be summarized as follows:
1. Insect Resistance
Insect-pests are the major scourge of agriculture down the ages as important crops and their high-yielding genotypes are highly susceptible to insect pests. The introduction of chemical pesticides has brought about a significant change in pest management practices but. unfortunately, resulted in adverse effects on human health, other biological organisms, and the environment. Although complete elimination of pesticides is neither feasible nor advisable; it is imperative to reduce the consumption of pesticides in agriculture and the environment for practicing safe and sustainable farming. Effective alternatives are now available in the form of genetically engineered crops resistant to insect pests that can be integrated into agricultural ecosystems. Insect-resistant transgenes whether of plant, bacteria, or any other origin can be introduced into plants to augment the level of resistance. These genes are obtained from micro-organisms like the Bt gene from Bacillus thuringiensis, ipf (isopentyl transferase) gene from Agrobacterium tumefaciens, and Pht gene from Phtorabdus luminescence, which when introduced into some specific crop provide resistance against the specific insects.
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